Mountain Ash - Short description and medicinal uses of Sorbus aucuparia. Sorbus Aucuparia: Rowan - Photographs of this tree, its fruit, bark, leaves and inflorescence. Sorbus rupicola - Several photographs of Rock Whitebeam on the Isle of Skye, and its description. Sorbus americana - Information on distribution and occurrence, value and use, characteristics, and fire ecology. Sorbus sitchensis - Information on distribution and occurrence, value and use, characteristics, and fire ecology. Sorbus americana: American Mountain-ash - Tree identification fact sheet with photos of the leaf, flower, fruit, twig, bark and form. Sorbus aucuparia: European Mountain-ash - Tree identification fact sheet with photos of the leaf, flower, fruit, twig, bark and form. Sorbus sitchensis: Sitka Mountain-ash - Tree identification fact sheet with photos of the leaf, flower, fruit, twig, bark and form.